Another question: Do you know, if replay gaining FLAC files is possible at all.

Thank you! huckele

Nope, don’t have replaygain support at this point — it would have to be done on the client side. — Ron

I’m not giving up, Ron. How about that idea, editing opt/sbin/mt-daapd-ssc.sh on my diskstation as following (found that in Roku forum). Will that work? My config:
Synology DS106j
Soundbridge M1001
SVN-1586 installed with cstern’s manual in this setup issues forum
***Updated today to svn-1696, does not work 😥